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ICSE Class 9 Answered

Tan18.tan23.cosec square 45.tan67.tan72 evaluate
Asked by Savipramod | 29 Oct, 2018, 12:46: AM
answered-by-expert Expert Answer
tan 18° tan 23° cosec2 45° tan 67° tan 72°
= tan (90° - 72°) tan (90° - 67°) (√2)2 tan 67° tan 72°
= cot 72° cot 67° × 2 tan 67° tan 72°
= 2 (cot 72° tan 72°) (cot 67° tan 67°)
= 2 × 1 × 1
= 2
Answered by Sneha shidid | 30 Oct, 2018, 12:25: PM
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